Alloy 903,Incoloy 903 Other/Similar Specs,,E FORU

British Specs:，American Specs:，German Specs:

**Product Introduction: Alloy 903 / Incoloy 903 - Comprehensive Specification Overview (UNS N19903)** **Overview** Alloy 903 (Incoloy 903) is a precipitation-hardenable, low thermal expansion superalloy from the nickel-iron-cobalt family. This specialized alloy maintains exceptional dimensional stability across a wide temperature range while delivering high strength and excellent mechanical properties. Originally developed for aerospace applications, its unique combination of controlled thermal expansion and high-temperature capability makes it suitable for various precision engineering applications where thermal stability is critical. **Key Characteristics** * **Controlled Low Thermal Expansion Coefficient** * **High Strength-to-Weight Ratio** * **Excellent Creep and Fatigue Resistance** * **Good Oxidation Resistance up to 500°C** * **Age-Hardenable Through Heat Treatment** * **Maintains Properties from Cryogenic to Elevated Temperatures** --- **Chemical Composition (Weight %)** | Element | Content (%) | |---------|-------------| | Nickel (Ni) | 36.0 - 39.0 | | Iron (Fe) | Balance | | Cobalt (Co) | 14.0 - 17.0 | | Niobium (Nb) | 2.90 - 3.50 | | Titanium (Ti) | 1.35 - 1.75 | | Aluminum (Al) | 0.70 - 1.15 | | Silicon (Si) | ≤ 0.30 | | Manganese (Mn) | ≤ 0.20 | | Carbon (C) | ≤ 0.05 | | Sulfur (S) | ≤ 0.015 | | Boron (B) | ≤ 0.012 | | Copper (Cu) | ≤ 0.20 | --- **Physical Properties** | Property | Value | |----------|-------| | Density | 8.25 g/cm³ (0.298 lb/in³) | | Melting Range | 1370-1425°C (2500-2600°F) | | Mean Coefficient of Thermal Expansion | 8.5 × 10⁻⁶/°C (20-400°C) | | Thermal Conductivity | 11.5 W/m·K (at 100°C) | | Specific Heat | 440 J/kg·K (at 20°C) | | Electrical Resistivity | 1.05 μΩ·m | | Modulus of Elasticity | 148 GPa (21.5 × 10⁶ psi) | | Poisson's Ratio | 0.30 | --- **Mechanical Properties (Typical Age-Hardened Condition)** | Temperature | Tensile Strength | Yield Strength | Elongation | |------------|------------------|----------------|------------| | Room Temperature | 1275 MPa (185 ksi) | 1035 MPa (150 ksi) | 15% | | 425°C (800°F) | 1170 MPa (170 ksi) | 965 MPa (140 ksi) | 12% | | 650°C (1200°F) | 965 MPa (140 ksi) | 825 MPa (120 ksi) | 10% | --- **Product Applications** * **Aerospace Industry** * Gas turbine engine components * Seals and rings for jet engines * Structural components requiring thermal stability * **Power Generation** * Turbine components * High-temperature fasteners * Heat exchanger parts * **Precision Instruments** * Laser system components * Optical mounting devices * Measurement equipment * **Automotive Sector** * Turbocharger components * High-performance engine parts * **Nuclear Applications** * Reactor core components * Control mechanism parts --- **International Standards & Specifications** **ASTM Standards:** - ASTM B637: Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock - ASTM B625: UNS N08904, N08354, and N09904 Plate, Sheet, and Strip **Aerospace Standards (AMS):** - AMS 5916: Ring, Sealing, Low Thermal Expansion, Vacuum Melted **International Designations:** - UNS N19903 - W. Nr. 2.4717 - NiCr19Co17Mo3Ti **European Standards:** - EN 10095: Heat resisting steels and nickel alloys - DIN 17742: Nickel alloys - Chemical composition --- **Heat Treatment Specifications** **Solution Annealing:** - Temperature: 980°C ± 15°C (1800°F ± 25°F) - Cooling: Rapid cool (water or air) **Aging Treatment:** - Primary Aging: 720°C ± 10°C (1325°F ± 20°F) for 8 hours - Secondary Aging: Furnace cool to 620°C ± 10°C (1150°F ± 20°F), hold 8 hours - Final Cooling: Air cool to room temperature --- **Similar and Related Alloys** * **Incoloy 907**: Enhanced version with improved thermal stability * **Incoloy 909**: Further refined with better overall properties * **Nimonic 903**: Similar composition with minor variations * **Alloy 945**: Newer generation with enhanced characteristics --- **Quality Assurance & Testing** * Chemical Analysis per ASTM E1473 * Mechanical Testing per ASTM E8/E21 * Non-Destructive Testing as required * Microstructural Examination per ASTM E112 * Grain Size Assessment per ASTM E112 --- **Note**: This specification covers the general requirements for Incoloy 903 across various product forms. Specific requirements for particular applications or product forms (bar, sheet, forgings, etc.) should be verified against the relevant detailed specifications and customer requirements. **Disclaimer**: The information provided is for reference purposes. Actual properties may vary based on manufacturing process, heat treatment, and specific product form. For critical applications, always consult the manufacturer's technical data sheets and conduct appropriate qualification testing.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3025 gallon liquid totes Special package is available on request.